Base for printing plates



June 17, 1924. 1,497,937

J. w. PITT BASE FOR PRINTING PLATES Filed March 15, 1923 3 Sheets-Sheet 1 June 17 1924. I

' J. w. PITT BASE FOR PRINTING PLATES s Shets-Sheet 2 Filed March 15, 923

@mmm

mjz'ramwg June 17,1924. I 1,497,937

J. W. PITT BAS E. FOR PRINTING PLATES Filed March 15, 1923 a Shets-Shee'l.

Patented June 17, 1924.

UNITED STATES 1,497,937" PATEN oFFIC'EQ JOHN w. PITT, OFBATI-I, NEW YORK.

BASE FOR PRINTING PLATES. j p v Application filed March 15, 1923. Serial No. 625,277.

To all whom it may concern: I

Be it known that 1, JOHN W. Prrr, a citizen of the United States, residing in the city of Bath, county of Steuben, State bodying this invention.

Figure 2 is a section of the encompassing frame at the line 2-2 on Figure 1 with the partition plates and blocks removed.

' Figure 3 is a section of the entire encompassing frame at the plane indicated at the line 33 on Figure 2.

Figure tis a plan view of a portion of the device at a certain stage in the process of assembling the elements. 4 Figures 5 and 5 are detail sections at the lines 5-5 and 55 on Figure Figure 6 is a plan view of the device at a later stage in the assembling and with all the blocks placed in their respectivecells but without certain of the intersecting positions of one set, the other side and the other end constituting a diagonally opposite rigid angle of the frame being shown in position ready to be moved into engagement with the parts of the other rigid angle and with the partitions of the set which is com plete in the assemblages Figure 7 is a perspective view of the partitions which are lacking in Figure 6 showing them from the outer side.

Figure 8 is a similar View of the same partitions seen from the opposite side.

' Figure 9 is a detail section at the line 9-9 on Figure 1. 1

Figure 10 comprises a perspective view of each of the three forms of blocks employed. The construction shown in the drawings comprises when completed a rigid rectan- Figure 1 is a plan view of a base exngular encompassing frame consisting of side bars, 1, l, and end bars, 2, 2, whichare distlngulshed as sides and ends merely for. convenience of description and not because of any difference between the two. dimensions of the parts. frame bars are rigidly secured at their cornersforming four rigid angles and the space whichthey encompass is subdivided into'cells by twoysets of'intersecting partitions, 3, 3 ,.3", 8 said sets being hereinafter distinguished as the first and second sets respectively; As shown these partitions are all oblique to the frame bars forming therefore in addltlon to rectangular cells certain rig ht an= gular marginal cells each half the area of the rectangular cells and forming at. each of the four corners a right angular cell onefourth the area of the rectangular'cells.; i

The cells are occupied by corresponding- 13; shaped and dimensioned blocks all 'indicated by the reference character, 'N, and distinguished by individual exponential characters. The partitions of the two sets intersect each other at the planes ofithe :inner facesof the frame bars; andthe latter therefore have vertical or transverse slots, 6 and 7, for engaging the partition ends which meet and intersect at said inner faces of the frame bars 'asseen in Figure 2. The partitions of the first sethave notches, 9, through half their width from the upper edge for interlocking with the partitions of the second set which have reciprocal notches, 10, from their lower edges for such interlocking. The partitions of the first set are entered longitudinally into the slots, 6, of the frame bars, andarepre vented from being enterediorsvithdra'wn vertically or transversely of'the frame'liars by having horizontal longitudinal'ribs, in, at their end portions which engage horizontal slots 8, which are cut in the frame bars midway in their height acrossthe in tersecting slots, 6 and 7 p N The partitions of the secon-d'set are entered into the slots, 7', of the frame bars vertically, or transversely of said bars and partitions, and are prevented from entering or withdrawing longitudinally or horizontally by their intersecting engagen'ientswith previously entered partitions of thd'first set, viz, at the notches, 9 and 10, of said partitions respectively.

The inner faces of the frame bars and When completed the" four 3 and 4 4 4 4 4 the faces of the partitions have horizontal ribs all designated, m, certain of them being hereinafter distinguished individually by exponential numerals; and the blocks, N, have horizontal grooves, a, distinguished by different numeral exponents for engaging said ribs to prevent withdrawal of either partitions or blocks transversely from the frame; and the partitions and blocks thus mutually lock each other against such withdrawal from the frame after the frame is completely closed up by and securement at diagonally opposite corners, as hereinafter described, of the two rigid angles each comprising a side bar, 1, and an endbar, 2, forming the other two diagonally opposite cornersof the frame, and by the insertion and securing of the final partition, 1 of the second set as hereinafter particularly described.

The detail construction as to presence and omission of the horizontal ribs on the walls of'sele'cted cells is designed with a view to facilitating assembling of the elements; and

- these details will now be described.

One ri id an le of the encom assin b t: b

frame being formed by securing rigidly tori-b m, on the end'portion of said partition bars engaging the slots, 8, of the frame bars. The corner block, N is now entered by horizontal movement between the partition bars, '3 and 3, the ends of the grooves on the right angle faces of said block, N engaging the ribs, m of said partition bars, '3 and 3, and sliding thereon as the block, N moves into its position at the corner of the frame where the horizontal ribs, m of the frame bars engage the horizontal grooves, M, of the block. The partition, 4, is now inserted vertically, its notches, 10, interlocking with the notches, 9, 'ofthe'partitions, 3 and 3, while its ends enter the-slots, 7, of the frame bars, 1 and 2, the face of said partition, 4, toward the block, N which may be referred to as the inner face, being plain, that is, without ribs, permitting it to be entered thus in close contact with the oblique face of the block, N Rectangular block, N and larger right angular blocks, N N ,are now slid into place between the partition plates, 3*, 3 '3- and 3, the lateral grooves 02 of the block, N and the ends of the grooves n on the oblique faces of the blocks, N N engaging the horizontal ribs, m of the partitions,'3 '3", 3 and 3 respectively, the groove, 11 on the inner face of the block, N engaging the rib, m on the outer face of the partition, 4?, and the grooves, n of the oblique faces of blocks, N N engaging the ribs, m", of the frame bars, 1 and 2. The partition plate, 4 is now entered vertically, its ends engaging the slots, 7, in the frame bars, 1 and 2, and its notches, 10, interlocking with the notches, 9, of the partition plates, 3, 3 3 and 3", said partition, 4:", being plain on its inner face so that it may be thus entered in proper close relation to the blocks, N and N', N.

Blocks, N, N N and N, and N, are now slid into their places between: the :partitions, 3 3 3, 3 and 3 ,their later-a1 grooves engaging the ribs, m of said partitions, the end of the groove, 11 on the oblique face of the block, Nflengaginga rib, m on the partition, 3 the groove, "h on the inner faces of at least oneof the blocks, N, N N engaging the rib, mien the outer face of the partition, 43 the.

groove, 4?, on one right angular face of'the block, N engaging the rib, m on the frame member, 2, and the groove, a on the oblique face of the block, N, engaging the'rib, in on the frame bar, 2.

to be engaged at its opposite ends with the frame bars, 1 and 2, respectively, the method of assemblage from this point differs slightly from that pursued hitherto. The rectangunext row and the small final cornerftri-- angular block, N constituting all the remaining blocks to be assembled inithe mai r ner now being described are now slid in between the partitions of the first-set. The rigid angle formed of the other frame bars, 1 and 2, is now positioned for being "advanced in the direction of the partitions of the first set for entering the ends of said partitions endwise in the slots, 6, of said frame bars, 1 and 2, which constitute/said second rigid angle, and simultaneously with the entering of these partitions into the frame bar slots, the ends of the frame bars forming said second rigid angle are engaged with the endsof the first rigid angle,-said frame bars being reciprocally tongued and mortised for said engagement, and the'engaged ends of the frame bars are securely pinned together completing the rigid cellencompassing frame. v

The blocks last entered comprising the three rows mentioned may now be moved to space the row, N N N N away from the row, N*, N, N N N enough to permit the entry vertically of the partition, 4', its ends engaging the slots, 7, of the side bars, 2, 2, of the frame and its notches, 10, interlocking with the notches, 9, of the partitions of the first set, said partition,'4-,

being perfectly plain on its inner side to- The partition, 3 being the last partition I row N N and" N and N, and the absence of the remaining away from the blocks of the row, N N

N,1N, N sufficiently to admit the ribs, m on the outer side of said partitio plate, 4.

The next row of blocks, N, N N N N", is now pushed back against the partition plate, 4, the grooves, M, on the inner faces of the blocks of this row engaging the ribs, m", on the outer face of the partition, 4, and the groove, n on the oblique face of the right angle block, N engaging the rib, m on the frame bar, 1. The row of blocks, N, N N will now be found spaced away from the row N N N N N sufficiently to permit the introduction vertically of the partition, 4 whose inner face is plain and outer face is ribbed, said partition, i has ribs, m only at the middle for engaging the groove, m of the block, N, interlooking with the partitions of the other set in the same manner as above described in respect to partition, 4:. The. blocks of the row, N N N may now be advanced against the outer face of the partition, 4

the grooves, m of these blocks engaging the ribs, m of the partition, 4

The final corner block, N being now forced snugly back into the rigid angle of the encompassing frame, the partition, 4',

is introduced vertically, said partition be-,

ing plain upon both faces and interlocking simultaneously with the frame bars, 1 and 2, and with the partitions, 3 and 3, of the first set. This final partition plate is now secured in a familiar manner, by screws, X, set into the frame bars at the ends of said partition plate, and this plate being thus locked in the frame blocks all the preceding elements, since there is no partition plate without at least one rib for engagement with a block, and the insertion of the last partition plate insures against disengagement of said ribs by lateral movement of the blocks.

I claim 1. A printing plate base comprising a rigid encompassing frame and intersecting partitions subdividing into cells the space enclosed by the frame; blocks occupying the respective cells; the partitions being interlocked at their intersections and the enclosing frame bars, partitions and blocks having interlocking ribs and grooves by whose interengagement the partitions and blocks respectively lock each other against withdrawal from th frame bars. a

2. In the construction defined in claim 1 foregoing, the partitions being oblique with respect to the encompassing frame bars and the two intersecting sets of partitions having intersections at the vertical planes of the inner faces of the encompassing framebars, the sa d frame bars having transverse slots meeting at said faces for, receiving the "ends of the partitions; and horizontal slots intersecting the verticalslots at the intersections of the latter, one set of said partitions having longitudinal ribs which engage the horizontal slots in the frame bars when said partitlons are engaged in the Vertical slots; I

whereby said partitions of said set are prevented from being enterable or withdrawable transversely and are adapted to be entered longitudinally into the frame bars, the other set being plain-surfaced at the ends which engage the frame bar slots, whereby they are enterable and withdrawable trans- I versely.

3. In the construction defined in claim 1 foregoing, the frame bars having transverse slots for entering the ends of the partitions, and longitudinal slots crossing said transverse slots; one set of partitions having longitudinal ribs extending to their ends adapted to engage the longitudinal slots of the 'frame bars when the partitions are entered longitudinally into engagement with said frame bars, and the other set of partitions having at the end portions which engage the frame bars plane faces whereby they are enterable transversely into the/transverse slots of the frame bars.

4. In the construction defined in claim 1 foregoing, the cells having their Walls which are formed by one set of partitions and the frame bars horizontally ribbed and one of the remaining walls formed by the other set of partitions plain-surfaced; whereby the blocks are enterable horizontally along the first mentioned ribs, and the second mentioned partitions are then enterable transversely to close the cells and retain the entered blocks.

5. In the construction defined in claim 1 foregoing, the cells having their walls which are formed by one set of partitions and the frame bars, horizontally ribbed, and one of their walls formed by the other set of partitions plain-surfaced; whereby the blocks are enterable horizontally along the first mentioned ribs and the second mentioned partitions are then enterable transversely to jt elflqgkiflg'ribs' and gropves by Whose inter at its e'nds in th fi'ame bafis zigifisfiyftibal .gngggem ent the partitions .and blocks re-- Withdrawal; t

frame bargpartitions gnd blocksrhmi ng inpartitiqns and f the blo ks tfor securing it s p'ectively lock each other against With- In tes many 'WhereQf, I have herunto set I dliawgtl from the f ame ba s, the finally inmy 'N.'Y., thiSdfi-y of "'sej ted p rtitionrb l pl in-s acedpn bo M 'Q 1 2. .1 =.Si d i$ and me n invsji fp n f he M11 OHN'W- P I I 

